123231320220 has 24 divisors (see below), whose sum is σ = 345047696784. Its totient is φ = 32861685376.

The previous prime is 123231320189. The next prime is 123231320257. The reversal of 123231320220 is 22023132321.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1026927609 + ... + 1026927728.

It is an arithmetic number, because the mean of its divisors is an integer number (14376987366).

Almost surely, 2^123231320220 is an apocalyptic number.

123231320220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123231320220 is an abundant number, since it is smaller than the sum of its proper divisors (221816376564).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123231320220 is a wasteful number, since it uses less digits than its factorization.

123231320220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2053855349 (or 2053855347 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 123231320220 its reverse (22023132321), we get a palindrome (145254452541).

The spelling of 123231320220 in words is "one hundred twenty-three billion, two hundred thirty-one million, three hundred twenty thousand, two hundred twenty".